Booked a 2-room apartment (sleeps 4, but only 2 bedrooms) with Internet and everything 5 min. away from the show, but Chase (Shoehorn here on GFY) already has the 2nd room... so if you don't mind sharing his room
On a serious note.. try
http://stayamsterdam.com/ if you don't find a hotel...
Amsterdam is high in demand hotel-wise so good luck with your search, it's less than a week time.
Steve